TROUBLESHOOTING 10.
9. Troubleshooting Safety Electricity power is still kept in capacitors even the power supply is shut off. Do not forget to discharge the electricity power in capacitor. Electrolytic Capacitors (HIGH VOLTAGE! CAUTION!) For other models, please connect discharge resistance (approx.100Ω 40W) or soldering iron (plug) between +, terminals of the electrolytic capacitor on the contrary side of the outdoor PCB. Note: The picture above is only for reference. The plug of your side may be different.
9.
9.2 Outdoor unit error display(TBD) 9.3 Diagnosis and Solution 9.3.1 EEPROM parameter error diagnosis and solution(E0/F4) Error Code E0/F4 Malfunction decision Indoor or outdoor PCB main chip does not receive feedback conditions from EEPROM chip. Supposed causes ● Installation mistake ● PCB faulty Trouble shooting: Power off, then restart the unit 2 minutes later. Yes Replace the indoor/outdoor main PCB.
9.3.2 Indoor / outdoor unit’s communication diagnosis and solution(E1) Error Code E1 Malfunction decision Indoor unit does not receive the feedback from outdoor unit during conditions 110 seconds and this condition happens four times continuously.
Remark: Use a multimeter to test the DC voltage between 2 port and 3 port of outdoor unit. The red pin of multimeter connects with 2 port while the black pin is for 3 port. When AC is normal running, the voltage will move alternately between -50V to 50V. If the outdoor unit has malfunction, the voltage will move alternately with positive value. While if the indoor unit has malfunction, the voltage will be a certain value.
9.3.3 Zero crossing detection error diagnosis and solution (E2) Error Code E2 Malfunction decision When PCB does not receive zero crossing signal feedback for 4 conditions minutes or the zero crossing signal time interval is abnormal. Supposed causes ● Connection mistake ● PCB faulty Trouble shooting: Check if the connections and power supply is normal? No Correct the connections. Turn on the unit when the power supply is good. Yes Indoor main PCB is defective. Replace indoor main PCB.
9.3.4 Fan speed has been out of control diagnosis and solution(E3) Error Code E3 Malfunction decision When indoor fan speed keeps too low (300RPM) for certain time, conditions the unit will stop and the LED will display the failure. Supposed causes ● Wiring mistake ● Fan ass’y faulty ● Fan motor faulty ● PCB faulty Trouble shooting: Power off, then restart the unit 2 minutes later No The unit operates normally. No Find out the cause and have it solved No Correct the connections.
Index 1: 1:Indoor or Outdoor DC Fan Motor(control chip is in fan motor) Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor connector. If the value of the voltage is not in the range showing in below table, the PCB must has problems and need to be replaced. DC motor voltage input and output(voltage: 220-240V~) NO. Color Signal Voltage 1 Red Vs/Vm 280V~380V 2 --- --- --- 3 Black GND 0V 4 White Vcc 14-17.5V 5 Yellow Vsp 0~5.
9.3.5 Open circuit or short circuit of temperature sensor diagnosis and solution(E5) Error Code E4/E5/F1/F2/F3 Malfunction decision If the sampling voltage is lower than 0.06V or higher than 4.94V, conditions the LED will display the failure. Supposed causes ● Wiring mistake ● Sensor faulty ● PCB faulty Trouble shooting: Check the connection between temperature sensor and PCB.
9.3.6 Refrigerant Leakage Detection diagnosis and solution(EC) Error Code EC Malfunction decision Define the evaporator coil temp.T2 of the compressor just starts conditions running as Tcool. In the beginning 5 minutes after the compressor starts up, if T2 ＜Tcool－2°C(Tcool－35.6°F) does not keep continuous 4 seconds and this situation happens 3 times, the display area will show “EC” and AC will turn off.
9.3.6 Overload current protection diagnosis and solution(F0) Error Code F0 Malfunction decision An abnormal current rise is detected by checking the specified conditions current detection circuit. Supposed causes ● Power supply problems. ● System blockage ● PCB faulty ● Wiring mistake ● Compressor malfunction Check the power supply No Stop the unit No Clear the blockage No Replace the compressor No Correct the connections or replace the wires.
9.3.7 IPM malfunction or IGBT over-strong current protection diagnosis and solution(P0) Error Code P0 Malfunction decision When the voltage signal that IPM send to compressor drive chip conditions is abnormal, the display LED will show “P0” and AC will turn off.
For example: Note: The photos below are only for reference, it’s may be not same totally with the ones on your side.
P-W N-U 14
N-V N-W 15
9.3.8 Over voltage or too low voltage protection diagnosis and solution(P1) Error Code P1 Malfunction decision An abnormal voltage rise or drop is detected by checking the conditions specified voltage detection circuit. Supposed causes ● Power supply problems. ● System leakage or block ● PCB faulty Trouble shooting: Check the power supply No Stop the unit No Correct the connections or replace the wires.
9.3.9 High temperature protection of compressor top diagnosis and solution(P2) Error Code P2 Malfunction decision If the sampling voltage is not 5V, the LED will display the failure. conditions Supposed causes ● Power supply problems. ● System leakage or block ● PCB faulty Trouble shooting: Check the air flow system of indoor and outdoor units Yes Clear up the air inlet and outlet or the heat exchanger of indoor and outdoor units.
9.3.10 Inverter compressor drive error diagnosis and solution(P4) Error Code P4 Malfunction decision An abnormal inverter compressor drive is detected by a special conditions detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and so on.
Main parts check 1. Temperature sensor checking Disconnect the temperature sensor from PCB, measure the resistance value with a tester. Temperature sensors. Room temp.(T1) sensor, Indoor coil temp.(T2) sensor, Outdoor coil temp.(T3) sensor, Outdoor ambient temp.(T4) sensor, Compressor discharge temp.(T5) sensor. Measure the resistance value of each winding by using the multi-meter.
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